The field head is the deformed portion of a rivet shank created during installation to lock the fastener in place. It is formed by upsetting the bucktail with a rivet gun and bucking bar, or by pulling a mandrel in a blind rivet. Its final shape and diameter dictate the pull-out strength of the joint.
Heard on the job
Check the diameter on that field head with the gauge to make sure it's fully upset.
Also heard as
- Shop head
- Driven head